Lock nut



J- F- EBER-r Filed Aug- 26, 194s June 5, 1945. l

Patented June 5, 1945` Joseph F. Ebert, Hollis, N. Y., assignor, by mesne assignments, to Smaller War Plants Corporation, New York, N. Y., a' corporation o! the United States l ApplcationAligust 26, 1943, Serial No. 500,044

6 Claims.

` This invention relates to lock-nuts and thel manufacture thereof.

In the application of. William Ruthven, Serial No. 472,333,led January 14, 1943, is disclosed a nut comprising a metallic polygonal body or bottom having a central threaded aperture and a polygonal socket composed of connected flat wall portions integral with the bottom. A locking member of complemental configuration tothe socket is received therein and has an opening therethrough alinedwith the bottom aperture. Each wall portion has an integral tapered tab,.the base of which is co-extensive with the top edge of the wall portion and each tab is bent inwardly over the locking member to hold the latter in the socket.

An object of this invention is to embody the nut structure above described of powdered metal.

A further object of this invention is a hghly` emcient and inexpensive procedure of producing such nuts at a high rate.

In the production of nuts according to this invention, a charge oi powdered metal is subjected to pressure by suitably shaped dies to produce a shell consisting of a perforated polygonal body portion and a connected series of wall portions dening a polygonal socket with each wall portion being integral with the body portion and having a tapering tab extending from the edge thereof. A thread is cut in the surface deiining the body portion aperture, after which the shell is subjectedto heat treatment under conditions suitable to fuse the compressed powdered metal Fig. 7 is a section of the completed nut taken substantially on the line 'I--l of Fig. 1.

As illustrated in Figs. 1, 2, and 6, a nut produced `according to thisv invention comprises a metallic hexagonal body or bottom, I having a central threaded aperture `2 and a hexagonal socket composed of connected at wall portions 3 integral with said bottom. A` resilient insert 4 of complemental configuration to the socket is received therein and has an opening 5 therethrough alined with the axis of the thread of the aperture 2 and of'a diameter less than the major diameter of the aperture thread. Each wall portion 3 has an integral arcuate extension or tab 6, the base of which is co-extensive with the tcp edge ofthe wall portion. The tabs 6 are bent in-` wardly over the insert to hold itin the socket and the taper ofeach tab is such that when folded in into a unitary mass.` A locking member complemental in shapeto the socket is introduced therein, after which the tabs are turned inwardly over the memberto lock it in the socket. According to this procedure the shell, together with its wall portions equipped with tapering-tabsis produced in a one-operation procedure.

Other objects. novel features and advantages of thisinventinn will become apparent from the following specification and accompanying drawing. wherein:

Fig. l is a plan view of a self-locking nut embodying the invention with a bolt inserted and serving to hold together two plates;

. Fig. 2 is a section on the line 2-2 of Fig. 1;

Figs. 3and 4 are vertical sections of an apraratus for pressing thel powdered charge into the form of a shell and illustrate such procedure;

Fig; 5 is an elevation partly in., section of the shell produced by the apparatus of Figs. 3 and 4;

`f Fig. 6 is a similar view ofthe completed shell,

and

it does'not interfere with the adjacent tab. Together the tabs provide a substantially continuous clamping ilange along the rim of the socket to retain the insert l securely in place and prevent ejection of the insert from the socket upon insertion of a bolt into the insert through the threaded aperture 2. 'I'he end surface 1 constitutes the face of the nut. As shown in Fig. 2.

thus constitutes the abutting face of the nut when i the nut is drawn home. The resilient insert 4 is shown herein as being non-metallic, but may be metallic. i

The procedure of constructing a shell is' illustrated in Figs. 3 and 4. In these figures, I0 designates a fixed member which supports a die block Il having' a cavity I2 of hexagonal czrosssection. In the bottom of the cavity I2 is a hexagonal block I 3 snugly fitting the cavity but movable therein and normally restingr on. the member I0. A rod Il extendsfrom the lower end of the block I3 through the member Ill and a pin IS-extends from the upper endfof the block a short distance above the die block II.

A plunger IB is carredby a movable member I1 and means, not shown,'are provided for effecting movement of the member I 1 toward and away from the member l0. The main portion of the plunger I6 is of hexagonal cross-section and is of proper size snugly to t the cavity I 2. The lower portion of each face of the plunger I8 is cut away so that when thepunch is inserted `in the die the space between each plunger face and each die `l taco is of the same shape as a. wel! portion 8 and appiieant's eri-pending application. Serial No.

' a tab 8. The exposed length oi' the plunger IB is 474,423, filed February 2, 1943.

less than the distance from the top of the die block I claim:

II to the top oi' the abutment yblock I3 so that 1. 'I'he method ot producing a seit-locking nut when the punch is fully inserted in the die, the 5 which comprises forming a charge containing bottom face of the punch is spaced from the top powdered metal under pressure into a shell coniace ofthe abutment block. Also. the plunger i6 sisting oi a centrally perforated polygonal body is provided with a recess Ita to receive the pin i5. portion and a connected series oi wail portions In the production ci. a nut, a charge oi lpowdeflning'e polygonal socket with each-well pordered metal is introduced into the cavity l2 with 10 tion being integral with said lbody portion, prothe nttvm block in its lowermvst position with vidlng t thread 1n the surface defining stidboty gamers 3 l socket having a continuous surface bottom except for said aperture and a continuous wall, said wall portions terminating in tapering integral tabs, and a polygonal resilient insert in said socket o! complemental size and shape to said socket to prevent relative rotation of said socket and insert, each tab being inturned over said insert without interference with an adjacent tab and providing a substantially continuous clamping iiange for said insert along the rim ot said socket to retain the insert in the socket, said base and wall portions and tabs comprising 5 powdered meta! pressed and sintered into a composite mass.

JOSEPH F. EBERT. 

